GLPI (Gestion Libre de Parc Informatique) is an
information resource manager with an
administration interface. You can use it to build
a database with an inventory for your company
(computers, software, printers, etc.). It has
functions to make the daily life of the
administrators easier, including a job/request
tracking system with mail notification and methods
to build a database with basic information about
your network topology. It provides a precise
inventory of all the technical resources (all
their characteristics are stored in a database)
and management and history of the maintenance
actions and the bound procedures. It is dynamic
and is directly connected to the users, who can
post requests to the technicians.

Nag is a Web-based application built upon the Horde Application Framework that provides a simple, clean interface for managing online task lists (i.e. TODO lists). It includes strong integration with the other Horde applications and offers shared task lists.

Ingo is an email-filter management application. It
is fully internationalized, integrated with Horde
and the IMP Webmail client, and supports both
server-side (Sieve, procmail, maildrop) and client-side
(IMAP) rule creation.

The Horde Application Framework is a modular, general-purpose Web application framework. It provides an extensive array of classes that are targeted at the common problems and tasks involved in developing modern Web applications.

Thunderbird is a total redesign of the
Mozilla mail component to produce a
cross-platform, stand-alone mail application using
the XUL user interface language. It has many new
features, among them the ability to customize
your toolbars the way you want them. a new look
and feel with a large number of downloadable
themes which alter the appearance of the client,
and the ability to add UI extensions.